Why You Might Not Want To Add Extra Espresso To Your Starbucks Frappuccinos - Tasting Table
Briefly

Starbucks Frappuccinos provide various flavors and customization options, but adding ingredients like extra espresso can change their texture. Many customers feel that Frappuccinos lack sufficient caffeine; for example, a Tall Americano contains 89.1mg of caffeine compared to just 23mg for a Tall Coffee Frappuccino. The Tall Espresso Frappuccino has the highest caffeine content in the Frappuccino line at 59.1mg, significantly more than other flavors such as the Tall Mocha Frappuccino, which has only 22.6mg. Size-up your cup for better balance with custom drinks.
When you change a recipe at Starbucks, you may find that the texture gets impacted. And I've noticed that espresso changes the texture much more than you might expect.
There's a significant difference between its weakest and strongest variations. For those craving a wake-up call, the Tall Espresso Frappuccino has an impressive 59.1mg of caffeine content.
Starbucks Beverage Nutritionals states that a Tall Americano contains 89.1mg of caffeine, while a Tall Coffee Frappuccino contains just 23mg.
Zoeller does empathize with the common complaint that Frappuccinos are 'too weak,' however. And it's not surprising that customers feel these drinks fall short.
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